Finding the Fourth Proportional to 1,510.14, 2,081.61 and 1,389.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,510.14 : 2,081.61 = 1,389.45 : x
2. Step 2: Convert to fraction form
   1,510.14/2,081.61 = 1,389.45/x
3. Step 3: Cross multiply
   1,510.14x = 2,081.61 × 1,389.45
4. Step 4: Simplify right side
   1,510.14x = 2,892,293.01
5. Step 5: Solve for x
   x = 2,892,293.01/1,510.14
6. Step 6: Final answer
   x = 1,915.25